I have two machines on the local intranet. They used to be able to talk to each other (ping, share files, etc.). Both are not successfully connected to the internet.

The problem machine (lets call it test machine) can't talk to my main machine. The test machine can ping other machines on the intranet (at least one of my coworkers), but not mine.

Odd. When I try to ping it from my machine, by machine name, I get Destination host unreachable.

• Both machines are on the intranet, with the network configured as Work
• Both machines have Windows Firewall disabled temporarily
• Both machines can talk to the internet (Google, SO, etc.)
• Neither machine can ping the other

I need help resolving this. What I really want to achieve, is to remote into the test machine from my main machine, like I used to be able to do a few weeks ago.

Some notes:

• Tried arp -a on both machines. I don't see the other machine's IP listed.
• Both machines have stable IPs; neither seems to have an IP conflict
• The configuration under ipconfig /all on my main machine mathces my coworker's machine. The test machine can ping his machine, but not my machine.
• The target machine times out trying to ping the main machine; the main machine gives me Destination host unreachable.
• I have rebooted both machines (several times) to no avail
• I have /release and /renewed both machines several times